<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        div{
            width: 200px;
            height: 200px;
            /* background: #ccc; */
            border-top: 100px solid red;
            border-right: 100px solid green;
            border-bottom: 100px solid blue;
            border-left: 100px solid yellow;
            border-radius: 200px;

            animation: scroll 2s linear 0s infinite;
        }

        @keyframes scroll{
            100%{
                transform: rotate(360deg);
            }
        }
    </style>
</head>
<body>
    <div></div>
</body>
</html>